Hi, i install a ATI 12-2 in my Fedora 16 x86_64, and i want to a extend of my desktop, how can i configure this in Fedora aticonfig ? Every time i put the VGA cable the ati expand the desktop, i dont want this, i want one extend screen on VGA.

open the Catalyst Control Center as root. The settings you want to change should be below display manager -> several displays (maybe it's called a little bit different, for me it displays everything in German language).

hm maybe. Did you start the Catalyst Control Center as Admin otherwise it will be grey. If it doesn't work you can try if xrandr detects the monitors correctly. Just enter xrandr in terminal and you will see a output.